<template>
    <div>
      <!-- 面包屑导航 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图区 -->
      <el-card>
        <!-- 警告区 -->
        <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" show-icon></el-alert>
        <!--选择商品分类区 -->
        <el-row class="cateLists">
          <el-col>
            <span>选择商品分类：</span>
            <el-cascader v-model="selectedKeys" :options="cateList" clearable
            :props="cascaderProps" @change="handleChange">
            </el-cascader>
          </el-col>
        </el-row>
        <!-- Tab页签区 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <el-tab-pane label="动态参数" name="many">
            <!-- 添加动态参数按钮 -->
            <el-row>
              <el-col>
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
              </el-col>
            </el-row>
            <!-- 动态参数表格 -->
            <el-table border :data="manyTabData" stripe>
              <!-- 展开列 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环tag标签 -->
                  <el-tag :key="i" v-for="(item,i) in scope.row.attr_vals" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!--tag 输入切换的文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column label="序号" type="index" width="60px"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParam(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <el-tab-pane label="静态属性" name="only">
            <!-- 添加静态属性按钮-->
            <el-row>
              <el-col>
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
              </el-col>
            </el-row>
            <!-- 静态属性表格 -->
            <el-table border :data="onlyTabData" stripe>
              <!-- 展开列 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环tag标签 -->
                  <el-tag :key="i" v-for="(item,i) in scope.row.attr_vals" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!--tag 输入切换的文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column label="序号" type="index" width="60px"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParam(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!-- 添加参数弹框 -->
      <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        <el-form :model="addForm" :rules="addRuleForm" ref="addFormRef" label-width="100px">
          <el-form-item label="参数名称" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>
      <!-- 修改对话框 -->
      <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <el-form :model="editForm" :rules="addRuleForm" ref="editFormRef" label-width="100px">
          <el-form-item label="参数名称" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  name: 'params',
  data () {
    return {
      /* 级联商品分类数据 */
      cateList: [],
      /* 级联选择框双向绑定到的数组 */
      selectedKeys: [],
      /* 指定级联选择器的配置对象 */
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        /* 次级菜单的展开方式 */
        expandTrigger: 'hover',
        /* 父子节点选中关联 */
        checkStrictly: true
      },
      /* 被激活的页签名称 */
      activeName: 'many',
      /* 动态参数 */
      manyTabData: [],
      /* 静态参数 */
      onlyTabData: [],
      /* 参数添加弹框 */
      addDialogVisible: false,
      /* 添加参数信息 */
      addForm: {
        attr_name: ''
      },
      /* 添加参数校验 */
      addRuleForm: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      },
      /* 修改参数弹框 */
      editDialogVisible: false,
      /* 修改表单数据 */
      editForm: {}
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    /* 获取商品分类列表数据 */
    async getCateList () {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) {
        return this.$message.error('商品分类列表数据获取失败！')
      }
      this.cateList = res.data
    },
    /* 监听 级联选择框 数据长度 变化 */
    handleChange () {
      this.getParamsData()
    },
    /* Tab页签 点击事件处理函数 */
    handleTabClick () {
      this.getParamsData()
    },
    /* 获取参数列表数据 */
    async getParamsData () {
      /* 确认是否选中 第三级分类 */
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTabData = []
        this.onlyTabData = []
        return false
      }
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('参数列表获取失败！')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        /* 控制tag文本框的显示与隐藏 */
        item.inputVisible = false
        /* 文本框中输入的值 */
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTabData = res.data
      } else {
        this.onlyTabData = res.data
      }
    },
    /* 监听 添加参数弹框 关闭事件 并重置 */
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    /* 添加属性按钮 */
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`/categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.addDialogVisible = false
        this.getParamsData()
        return this.$message.success('添加参数成功！')
      })
    },
    /* 监听 修改弹框 关闭事件 并重置 */
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    /* 编辑按钮 */
    async showEditDialog (id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    /* 修改属性 */
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('参数更新失败，请重新编辑！')
        }
        this.getParamsData()
        this.editDialogVisible = false
        return this.$message.success('参数更新成功！')
      })
    },
    /* 删除属性 */
    async removeParam (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该属性, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(error => error)
      /* 取消：cancel 确认：confirm */
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消操作！')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.getParamsData()
      return this.$message.success('删除参数成功！')
    },
    /* 当tag标签 被摁下enter键 或 失去焦点时 触发 */
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      /* 没有return 则输入内容没有问题 添加并重置 */
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    /* 点击按钮 展示tag输入文本框 */
    showInput (row) {
      row.inputVisible = true
      /* 让文本框自动获取焦点
      *  $nextTick 方法的作用： 就是当页面元素重新被渲染后 才会指定调用回调函数中的代码
      * */
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    /* 删除属性下的参数 */
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    /* 提交参数数据 */
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
    }
  },
  computed: {
    /* 如果添加按钮需要禁用 则返回true */
    isBtnDisabled () {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    /* 第三级分类 id */
    cateId () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    /* 添加弹框 提示信息 */
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
  .cateLists {
    margin: 15px 0;
  }
  .el-tag {
    margin: 5px;
  }
  .input-new-tag {
    width: 100px;
  }
</style>
